These letters and diaries of a young ensign in the 3rd Foot Guards during the Peninsular War provide a remarkably vivid first-hand account of one of the great campaigns in British military history. John Aitchison was present at most of the major actions of the war, both in Spain and Portugal, including the capture of Oporto, the Battle of Busaco, the defence of the Lines of Torres Vedras and the Battles of Talavera and Vitoria. His letters abound with remarkably precise descriptions of campaign tactics, comments on Wellington's decisions and observations on the locals and the country he passes through. Expertly edited and amplified by W.F.K. Thompson, these letters also reflect in ample measure the cold, wet and hunger, the forced marches and terrifying slaughter that are the inevitable consequences of war.